Combustion-gas-sampling apparatus



Feb. 7, 1 928.

1,658,391 F. D. POTTER COMBUSTION ens SAMPLING APPARATUS Filed Julyll. 1925 2 Sheets-Sheet 1 I N VEN TOR ATTORNEY Feb. 7, 1928.

F. D. POTTER COMBUSTION GAS SAMPLING APPARATUS Filed Julyll. 1923 2 Sheets-Sheet 2 MACHINE IN VEN TOR A TTORNE Y Patented Feb. 7, 1928.

UNITED "STATE runners]; n. rorrnn, or mes, newsman asemmon .ro ooinnsrxon c011- rnor. conn ng me, or new YORK, N. in, A comauxonor nnw 203x.

comausrIon-oAs-samnme Ham's.

- Application med ally 1:1 192:. sw rm.

My invention relates to apparatus for tak ing a continuous representatiye sample of gases from the combustion chamber of a furnace or other combustion apparatus, fiwhi-ch can be used for obtaining an indication of temperature corresponding to the furnace temperature, and for other "pun poses. 1

An embodiment "of tilie invention is illusl tratedherein in connection With*'a-coal-fired boiler furnace, but theinventi'on 'is a ple cable to combustion apparatus generally, and to the use'of any desired fuel.

According to the present' invention "hot gases from the combustion chamber are dra'vvnpast a. temperature staking device; as

a thermocouple in its protecting tube, which is located-away and; thereby protected'froin destruction by the furnace temperature, but

serves to givev the average" temperature of the gases, from which the actual tempera ture of the furnace itself can be determined by adding a'diflerential figure. Such differential figure can be determined, for example, with a particular boilerfi-rebox or other combustion apparatus, and a particular-sort of fuel, by taking a series of visual pyrom'eter furnace readings contemporaneously witha similar'series?of pyrometer' readings, and iiotin theavera-ge difie'rence,

which is to be a-d in the construction of the like. f The gases drawn fromf theiurnaee are V preferably returnedthereto with additional air mixed therewith, thereb providing a circulation which assists-com ustion and se cures improved admixture of furnace gases,

' which in turn assists ins-u plying well even aged samples of gas to e taken past the thermocouple.

care of, and the cooling efleet of the atmosphere serves to keep the apparatus from" gettin unduly hot, Y 1

Wit the referred form 'of apparatus the gas circulation past the th'ermooouple'isse 5 with additional air to the furnace and pref --erably though not necessaril air'to y,

mocouple or equivalent ed' to *p remeter lead f ings to give actual furnacetemperatures;

This correction can be 'inade automatically in various ways, as by ofiset-charts, changes p provided" with the hot gas passage 15 and is preferably molded. orotherwise formed to Thegas conduit" preferably extends -out-" side the furnace Where it can be easily takentheincoining for suction and blast is made use of to preoo'ol the gas passage between the furnace and the region Where the thertemperature taking device is located. Y

l'isya part perspective and part diagrammatioal view showingf a boiler furnace aceor' anee'with my invention.

Fig. ,2 is an enlarged horizontal sectional view offthe gas 'condnitand related parts shown'in Fig. 1. I

Fig. 3 is aside view, of the parts shown in horizontaisection in Fig.2. a

' Fig. i is a section on line H, Fig. 5.

Fig. 5-is a section'on'line 55, Fig.2.

Fig. 6 is): view "similar to Fig. 2, and showing a modification wherein theinoom equip ed with a gas sampling apparatus in ing air is not made use of-for conduitcoolmg, and Fig. 7 is a cross-section 011 111 9 7+7, Fig.6. u a e.

Reference character 10 designate bustion apparatus, a coal-fired boiler fur-v nace with gmte bars 11 being "shown for "per oses ofillustration. An openin 12 is me ethrouglt theside wall 13 of rnace s5 10 for the reception of about resistant gas passage member '14," which is preferably made of a high tile, adapted to; stand' up under high heat. Member 14 is provide an air cooling jacket aboutthe Walls formed in t e upper part of member 14, coming. in through ports 18, 1S, and traveling in the direction of the arro'wso'nFig. 2, passes downwardly through; openings 19, 19, and thence paws forwarcll through'the passage =20 provided below t-li horiz'ontel'partition walls orbaflles 21, 21 to the intake pipe 22 0f the honor blower 23. Blower 23, which-maybe driven from any convenient source. of power, is here shown as actuated :froin the electric motor 24.

Gas passage 15, in the'form shown, C0111- municates with and terms part of a conduit, the reniaincler 25] whereof is preferably provided as a pipe 26 of cast iron or heat resisting metallic alloy, which may e preferably 100 p discharge into the gas column at any convenient point, as at the: stacker backof the furnace bridge wall, but preferably its outlet 27 is directed back into the furnace as shown. "The air discharge from blower 23- the preferable form, the pipe 26 is consired way, it is preferable to have the ad dition' made automatically, as. by offset. 7

tractedat 29 to form a Venturi passage 30 and the air supply pipe -3 1is arranged at about the region of greatest contraction of the Venturi passage. In this way sufficient suction iscreated to draw furnace gases through passage 15 and past thermocouple 28. I r r The discharge of the furnace gases with the added air into the combustion chamber at 27 sets up a circulation within the combustion chamber, as indicated by the arrows on Fig. 1, thereby assistingcombustion and keeping the gases in a state of thor-. ough admixture. With this arrangement, the gases drawn past the thermocouple are thoroughly mixed and are closely representative of the average gas temperature con-- ditions within the combustion chamber.

The form of Figs. 6 and 7 is like that already described, except that the member 14 is not air cooled and theair intake pipe 22 takes air directly from the atmosphere. The thermocouple 28 may be. connected up by its lead wires 33, 35k to any suitable indicating device,-such, for example, as the automatic recording instrument 35 indicated I in Fig. 1. As already stated,.while the instrument 35 may be arranged as usual to indicate temperatures of the thermocouple and the corrective addition made in any decharts, specialconstruction of recorder arm, or in other ways, so asto show furnacetemperatures directly. j I,

The parts may be made up in any suit able way to facilitate-assembly. I have shown pipe 26 parted at the region of smallest diameter'and secured together by sleeve 32.

A plugged openingi36 ispreferablyplaced in the conduit opposite passage 15 -leading from the furnace to admit aslice bar for pushing out any material which may become determination of CO contentby Orsat or other suit-able apparatus. One-wayin which this can be done is illustrated in Fig. 3-

where apipe 37 is taken from the-conduit near theinlet end and leads to a C0 apparatus indicated diagrammatically at 38. The pipe 39 from the CO apparatus 38 is led into the air blastpipe 31, and being pointed in the same direction as pipe 31, suction is produced drawing the gases of combustion through the CO apparatus. Such arrangement is particularly useful where it is desired to secure a series of temperature determinations and conten'iporaneously to take the corresponding CO content of the combustion gases.

The embodiment illustrated is for purposes of illustration only and for affording an understanding of ways in which the invention can be carried out.v Modifications and changes may be resorted to within the .scope of my claims.

I claim:

1. The combination with a combustion apparatus comprising a combustion chamber, of a conduit communicating with said combustion apparatus at both ends, the inlet thereof being from the. combustion chamber, power means for creating a circulation of combustion gases through said conduit, means for taking the temperature of the combustion gases. between the combustion chamber and the circulating means, a C0 machine, an intake pipe therefor extending into said conduit and having its inlet directed against the gas stream, and an outlet pipe therefor extending into said conduit and having its outlet directed with the flow of the gas stream in said conduit.

2. The combination with a combustion apparatus comprising acombustion chamberof a conduit communicating with the combustion chamber at both ends and having the intake end provided with an air passage extending about the conduit of air blast means for causing ,a flow of combustion gases through the conduit, said air blast means beingarranged totake the air for the air blast through the said air passages, whereby the intake portion of the conduit is air cooled.

3. The combination witha combustion apparatus comprising a combustion chamber of a conduit communicating at both ends with the combustion chamber, and air blast means for inducing a flow of combustion gases through the conduit, said air blast means being arranged to take the air from around a portion of the conduit, whereby said portion of the conduit is cooled.

4:. The combination with a combustion'apparatus comprising ,a combustion chamber, of

a conduit communicating at both ends with the combustion chamber, an air blast pipe discharging longitudinally of said conduit.

andthoroughly mixing the gases in thecombastion chamber and assuring that the gases entering the conduit are represent-'atlve of average temperature, etc., cond tions within the combustion chamber, and temperature taking means exposed to the gases in the conduit between the entry end thereof and 7 reduced diameter to thereby form a venturi,

a pipe within said conduit and having its discharge end in the Venturi portion of the conduit, a blower for forcing a blastof air through said pipe to therebycreate acirculaticn of combustion gases within the chamber and to commingle additional air therewith, the portion of the conduit issuing from the combustion chamber being provided with an air jacket, and means for taking the intake air for said blower through said air jacket, whereby such portion ofthe conduit i air cooled.

6. The combination with a combustion apparatus comprising a combustion chamber of a conduit leading out of and back into the combustion apparatus of air blast means discharging substantially axially of said conduit for causing a flow of combustion gases through the conduit, and a suction pipe so arranged that a suctionis provided therein by said air blast, said suction pipe having its opposite end arranged to receive furnace,

gases from the conduit and supply same to testing apparatus such as a C0 machine. 7 The combination with a furnace having a combustion chamber of a conduit communicating with the combustion chamber at both ends and having an intermediate substantially Venturi section of reduced di- I ameter, a blower having a discharge pipe extending into saidconduit substantially axially thereof at the Venturi portion thereof, whereby a-flow of furnace gases is created through said conduit and thegases are re-[ turned to the combustion chamber with ad ditional air, temperature taking means for taking temperature of gases passing through said conduit at a point between the combustion chamber and the air blast discharge, a testing apparatus such as a C0 machine, 'SEtld testing apparatus having intake con:

nection in the neighborhood of the intake portion of the conduit and having a suction outlet pipe connectedtherewith, said [suction pipe extending into the conduitin the .neighborhood of the air discharge pipe,

whereby furnace gases are passed through the CO machine and are adapted to have their CO content taken simultaneously with the taking of temperatures of the ,gasespassing through theconduit. i,

'In' testimony whereof, I have signed my name hereto. 7

FREDERICK DJPOTTER; 

